87851. A slender shaft supported on two bearings at its ends carries a disc with an eccentricity e from the axis of rotation. The critical speed of the shaft is Nc. If the disc is replaced by a second one of same mass but mounted with an eccentricily 2 e, then the critical speed of the shaft in the second case is
87852. The mechanism in which two are turning pairs and two are sliding pairs, is called a
87853. In a multiple V-belt drive, all the belts should stretch at the same rate.
87854. In a reciprocating engine, usually __________ of the reciprocating masses are balanced.
87855. When there is a reduction in amplitude over every cycle of vibration, then the body is said to have
87856. In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is
87857. In a disc clutch, if there are n1 number of discs on the driving shaft and n2 number of discs on the driven shaft, then the number of pairs of contact surfaces will be
87858. The effect of swaying couple in a locomotive is resisted by the side pressure between the flanges of the tyres of the wheel and the inside of the rails.
87859. The Klein's diagram is useful to find
87860. The equation of motion for a single degree of freedom system with viscous damping is . The damping ratio of the system is
87861. The ratio of the number of teeth to the pitch circle diameter in millimetres, is called
87862. The ratio of the pitch circle diameter in millimetres to the number of teeth, is called circular pitch.
87863. The rotating shafts tend to vibrate violently at whirling speeds because
87864. Which of the following is an inversion of a double slider crank chain?
87865. The unbalanced force due to revolving masses
87866. The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)
87867. If the rotating mass of a rim type flywheel is distributed on another rim type flywheel whose mean radius is half the mean radius of the former, then energy stored in the latter at the same speed will be
87868. The Grubler's criterion for determining the degrees of freedom (n) of a mechanism having plane motion is (where l = Number of links, and j = Number of binary joints)
87869. In a Hartnell governor, if a spring of greater stiffness is used, then the governor will be
87870. When two pulleys are connected by means of an open belt drive, then both the pulleys will rotate is opposite directions.
87871. A mechanism consisting of four links is called a __________ mechanism.
87872. The amplitude of vibration is always __________ the radius of the circle.
87873. An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the
87874. In vibration isolation system, if ω/ωn > 1, then the phase difference between the transmitted force and the disturbing force is
87875. Which of the following is an inversion of a single slider crank chain?
87876. A very sensitive governor will cause hunting.
87877. In a radial cam, the follower moves
87878. The piston slide valve is an inside admission valve.
87879. The critical speed of a shaft in revolution per second is __________ as that of natural frequency of transverse vibration.
87880. Which of the following is a turning pair?
87881. In a simple train of wheels, the velocity ratio __________ the intermediate wheels.
87882. The two elements of a pair are said to form a higher pair, when they
87883. The maximum fluctuation of energy is the
87884. The method of obtaining different mechanisms by fixing in turn different links in a kinematic chain, is known as
87885. In a steam engine, the link constitutes a
87886. The secondary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is
87887. In a kinematic chain, a quaternary joint is equivalent to
87888. For dynamic balancing of a shaft
87889. The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft, and α = Semi-angle of the cone)
87890. A railway bridge is an example of a machine.
87891. Scott Russell's mechanism is made up of sliding pair.
87892. Which of the following is an example of a higher pair ?
87893. The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
87894. Which of the following property of the instantaneous centre is correct ?
87895. Whitworth quick return motion mechanism is an inversion of a double slider crank chain.
87896. The maximum gyroscopic couple acting on the ship tends to shear the holding down bolts.
87897. In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set to
87898. A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is
87899. Torsional vibrations are said to occur when the particles of a body moves
87900. A body is said to vibrate with simple harmonic motion if its acceleration is proportional to the distance from the mean position.
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